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5-(((2/3)*x^3)/7) = 0
(-2/21)*x^3+5 = 0
-2/21*x^3 = -5 // : -2/21
x^3 = 105/2
x^3 = 105/2 // ^ 1/3
x = (105/2)^(1/3)
x = (105/2)^(1/3)
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